CN108790153B - Powder spreading device and printer - Google Patents

Abstract

The powder spreading device comprises a forming bin, an intermediate powder feeder and a powder spreader, wherein the intermediate powder feeder comprises a powder seat and a powder feeder, a first feeding channel, a second feeding channel, a first discharging channel, a second discharging channel and a first accommodating space are formed on the powder seat, the first feeding channel is used for accommodating first powder to be formed, the second feeding channel is used for accommodating second powder to be formed, the first accommodating space is used for accommodating the powder feeder, the powder feeder is used for moving the first powder to be formed from the first feeding channel to the first discharging channel once or for multiple times along a first direction and moving the second powder to be formed from the second feeding channel to the second discharging channel once or for multiple times along a second direction; the powder spreader comprises a scraper mechanism, and the scraper mechanism is used for spreading the first powder to be molded or the second powder to be molded, so that the powder spreading amount can be accurately controlled.

Description

Powder spreading device and printer

technical field

The invention relates to the technical field of laser forming, in particular to a powder spreading device for a 3D (three-dimensional, three-dimensional) printer and a 3D printer.

Background technique

3D printer, also known as three-dimensional printer, is a kind of rapid prototyping technology, based on digital model files, using metal or non-metallic materials to form powder, melting/melting the laid flat powder to be formed layer by layer, and then Solidification build-up molding to construct three-dimensional solid printing equipment. A general 3D printer includes a powder spreading device and a laser device. When performing 3D printing, after the laser device has sintered a layer of powder to be formed, the powder spreading device will spread the powder to be formed, so as to perform a new step. The sintering action of the powder to be shaped. A general powder spreader controls the amount of powder spread by controlling the inclination angle of the powder spreader in the powder spreader, so the precision requirements for the connection bearings of the powder spreader and other mechanisms are relatively high. However, since the 3D printer will generate a large amount of smoke and dust during the solid molding process, there will be a lot of smoke and dust in the molding chamber where the powder spreading device is located, and the smoke and dust will easily enter the connecting bearings and other mechanisms of the powder spreading device, thereby degrading the performance of the powder spreading device. Powder spreading accuracy.

Contents of the invention

In view of the above, it is necessary to provide a powder spreading device and a printer that can precisely control the amount of powder spreading.

A powder spreading device, the powder spreading device includes a forming bin, an intermediate powder feeder and a powder spreading device, wherein: the intermediate powder feeder is fixed in the forming bin, and the intermediate powder feeder includes a powder seat and a powder feeder, the powder seat is formed with a first feed channel, a second feed channel, a first discharge channel, a second discharge channel and a first storage space, and the first feed channel is used To accommodate the first powder to be formed, the second feed channel is spaced from the first feed channel, the second feed channel is used to accommodate the second powder to be formed, and the first discharge channel is used for For the first powder to be formed to fall from the powder seat, the second discharge channel is spaced apart from the first discharge channel, and the second discharge channel is used for the first The powder to be molded falls from the powder seat, the first storage space is used to accommodate the powder supply device, and the powder supply device is used to be driven one or more times along the first direction one or more times The movement transports the first powder to be formed from the first feed channel to the first discharge channel, and is driven one or more times to move the second powder to be formed in the second direction one or more times. The molding powder is transported from the second feed channel to the second discharge channel; the powder spreader is moved and arranged in the molding bin, and is located below the intermediate powder feeder, and the powder spreader includes A scraper mechanism, used for paving the first powder to be shaped or the second powder to be shaped.

The present invention realizes multiple quantitative powder adding actions by controlling the powder feeder to move back and forth one or more times, and precisely controls the amount of powder spreading; by controlling the powder feeder to move along the first direction or along the Adding the first powder to be molded or adding the second powder to be molded by moving in the second direction; adding the powder by controlling the powder feeder to move in the first direction or in the second direction The powder action does not need to accurately control the rotation angle of the powder feeder, which reduces the installation accuracy requirements of the powder spreading device.

Description of drawings

Fig. 1 is a schematic structural view of a powder spreading device according to the first embodiment of the present invention, wherein the intermediate powder feeder and the powder spreading device of the powder spreading device are in a cut-off state.

Figure 2A is a schematic diagram of the state in which the first storage tank of the intermediate powder feeder in Figure 1 is connected to the first discharge channel of the intermediate powder feeder, and Figure 2B is the second storage tank of the intermediate powder feeder in Figure 1 and the intermediate powder feeder. Schematic diagram of the conduction state of the second discharge channel of the feeder.

Fig. 3A is a schematic diagram of the state where the powder spreading device in Fig. 1 is in communication with the first material storage channel and the first feeding channel, and Fig. 3B is a state diagram of the powder spreading device of the powder spreading device in Fig. 1 being in communication with the second material storage channel and the second feeding channel state diagram.

Fig. 4 is a structural schematic diagram of the limiting device and the powder supply device of the powder spreading device in Fig. 1 .

Fig. 5A is a schematic diagram of the limiting device of Fig. 4 and the first triggering device of the powder supply device in a triggered state; Fig. 5B is a schematic diagram of the limiting device of Fig. 4 and the first triggering device of the powder supply device in a non-triggering state.

Fig. 6 is a schematic structural view of the powder spreading device according to the second embodiment of the present invention, wherein the intermediate powder feeder and the powder spreading device of the powder spreading device are in a cut-off state.

Figure 7A is a schematic diagram of the state in which the first through hole of the intermediate powder feeder is connected to the first discharge channel of the intermediate powder feeder in Figure 6, and Figure 7B is the second through hole of the intermediate powder feeder in Figure 6 and the intermediate powder A schematic diagram of the conduction state of the second discharge channel of the device.

Fig. 8A is a schematic diagram of the state in which the powder spreader in Fig. 6 is in communication with the first storage channel and the first feeding channel, and Fig. 8B is a schematic diagram in which the powder spreader in Fig. 6 is in communication with the second storage channel and the second feeding channel.

Fig. 9 is a structural schematic diagram of a preferred printer according to the present invention with part of the structure omitted.

Explanation of main component symbols

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

In the present invention, unless otherwise clearly specified and limited, for orientation words, such as the terms "above", "below", "upper end", "lower end", "lower surface", "clockwise", "counterclockwise" , "Left", "Right" and other indication orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have A specific orientation, construction and operation in a specific orientation should not be construed as limiting the specific protection scope of the present invention.

In the present invention, unless otherwise clearly stated and limited, a first feature being "on" or "under" a second feature may include direct contact between the first feature and the second feature, or may include the first feature and the second feature Not in direct contact but through another characteristic contact between them. Moreover, "above", "below" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature the height of. "Above", "under" and "below" the first feature on the second feature include that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally higher than the second feature.

In the present invention, unless otherwise specified and limited, the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. Thus, definitions of "first" and "second" features may expressly or implicitly include one or more of these features.

In the present invention, unless otherwise clearly specified and limited, if there is a term "connection", the term should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection ; It can be directly connected, or connected through an intermediary, or two components can be connected internally. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Please refer to FIG. 1 . FIG. 1 is a schematic structural view of a powder spreading device according to a first embodiment of the present invention, wherein the intermediate powder feeder and the powder spreading device of the powder spreading device are in a cut-off state. The powder spreading device 1 includes a forming chamber, an intermediate powder feeder 10, a powder spreading device 20 and a limiting device 30 (as shown in FIG. 4 ). The forming chamber includes a forming area 40 . The intermediate powder feeder 10 is fixedly arranged in the molding chamber and is located above the molding area 40 . The intermediate powder feeder 10 is used to be triggered by the limiting device 30 to control the powder amounts of the first powder to be formed and the second powder to be formed falling into the powder spreader 20 . The powder spreader 20 is moved and installed in the forming chamber, and is located below the intermediate powder feeder 10 and above the forming area 40 . The powder spreader 20 can drive the limit device 30 to move, and is used to select the first powder to be molded or the second powder to be molded to drop to the molding area 40, and to control the shape of the molding area. 40 carry out powder spreading operation.

In this embodiment, the powder spreading device 1 further includes a powder supply bin 50 . The powder supply bin 50 includes a first powder supply bin 51 and a second powder supply bin 52 . The first powder supply bin 51 and the second powder supply bin 52 are located above the intermediate powder feeder 10 . The first powder supply bin 51 is used to accommodate the first powder to be molded, and the second powder supply bin 52 is used to accommodate the second powder to be molded. The material of the first powder to be shaped and the second powder to be shaped can be the same or different. In this embodiment, the materials of the first powder to be formed and the second powder to be formed are different, for example, the first powder to be formed is metal powder, and the second powder to be formed is ceramic powder. The first powder supply bin 51 and the second powder supply bin 52 are used to supply powder to the intermediate powder feeder 10 . The first powder supply bin 51 and the second powder supply bin 52 are respectively formed with a first opening 511 and a second opening 521 . In this embodiment, the first opening 511 and the second opening 521 are respectively located on the lower surfaces of the first powder supply bin 51 and the second powder supply bin 52 . In other embodiments, the first powder supply bin 51 and the second powder supply bin 52 are external components.

The intermediate powder feeder 10 includes a powder feeder 11 , a powder feeder 12 and a reset member 13 (as shown in FIG. 4 ). The powder seat 11 is located below the first powder supply bin 51 and the second powder supply bin 52 . The powder base 11 is formed with a first feeding channel 111 , a second feeding channel 112 , a first discharging channel 113 , a second discharging channel 114 and a first receiving space 115 . The first feeding channel 111 communicates with the first opening 511 for receiving the first powder to be formed falling from the first powder supply bin 51 . The second feeding channel 112 is spaced apart from the first feeding channel 111 . The second feeding channel 112 communicates with the second opening 521 for receiving the second powder to be formed falling from the second powder supply bin 52 . In this embodiment, the first feeding channel 111 and the second feeding channel 112 are located at the upper end of the powder seat 11 . The first discharge channel 113 is used for the first powder to be formed to drop from the powder seat 11 . The second discharge channel 114 is spaced apart from the first discharge channel 113 . The second discharge channel 114 is used for the second powder to be formed to drop from the powder seat 11 . In this embodiment, the first discharge channel 113 and the second discharge channel 114 are located at the lower end of the powder seat 11 . The first receiving space 115 communicates with the first feed channel 111 , the second feed channel 112 , the first discharge channel 113 and the second discharge channel 114 . The first storage space 115 is used to accommodate the powder supply device 12 .

The powder feeder 12 includes a first roller 121a. The first roller 121 a is rotatably accommodated in the first accommodation space 115 . A first receiving groove 122a and a second receiving groove 123a are formed on the first roller 121a. The first receiving groove 122a and the second receiving groove 123a are disposed on the circumferential surface of the first roller 121a. The first receiving groove 122a and the second receiving groove 123a are spaced apart from each other. In this embodiment, in an initial state, the first storage tank 122 a communicates with the first feed channel 111 , and the second storage tank 123 a communicates with the second feed channel 112 . The first storage tank 122a is used to store the first powder to be molded, and the second storage tank 123a is used to store the second powder to be molded. The first roller 121a can be driven by a motor, an air cylinder or a limiting device 30 to rotate in a first direction so that the first receiving groove 122a communicates with the first discharge channel 113 (as shown in FIG. 2A ), and It can be rotated along the second direction so that the second receiving groove 123a communicates with the second discharge channel 114 (as shown in FIG. 2B ). In this embodiment, the first roller 121a is driven to rotate by the limiting device 30 . In this embodiment, the first direction is counterclockwise, and the second direction is clockwise. In this embodiment, the rotation angle of the first roller 121a along the first direction may be within a predetermined range, as long as it can realize the communication between the first receiving groove 122a and the first discharge channel 113 , The angle of rotation along the second direction can also be within a predetermined range, as long as it can realize the communication between the second receiving groove 123a and the second discharge channel 114, it is not necessary to precisely control the rotation of the first roller 121a Angle. In this embodiment, the first roller 121a can be driven one or more times to rotate along the first direction one or more times to transfer the first powder to be molded stored in the first storage tank 122a from the first The feed channel 111 is transported to the first discharge channel 113, and can be driven one or more times to rotate in the second direction one or more times to move the second powder to be molded contained in the second storage tank 123a from the second storage tank 123a The second feed channel 112 is transported to the second discharge channel 114. Therefore, the present invention can control the powder spreading amount of the powder spreading device 1 by controlling the first drum 121a to rotate one or more times to realize one or more quantitative powder additions.

In other embodiments, in the initial state, the first storage tank 122a is separated from the first feed channel 111, and the second storage tank 123a is separated from the second feed channel 112. . The first roller 121a can be driven to rotate along the first direction so that the first receiving groove 122a communicates with the first feeding channel 111 to accommodate the first powder to be molded, and continues along the When rotating in the first direction, the first storage tank 122a communicates with the first discharge channel 113, so that the first powder to be molded is transported from the first feed channel 111 to the first discharge channel 111. Material channel 113. The first roller 121a can be driven to rotate along the second direction so that the second receiving groove 123a communicates with the second feeding channel 112 to accommodate the second powder to be molded, and continues to move along the second direction. When rotating in the second direction, the second storage tank 123a communicates with the second discharge channel 114, so that the second powder to be molded is transported from the second feed channel 112 to the second discharge channel 114. Material channel 114.

Please refer to FIG. 4 at the same time. FIG. 4 is a schematic diagram of the structure of the limiting device and the powder supply device of the powder spreading device. The powder feeder 12 also includes a first trigger device 124a. The first triggering device 124a is fixedly connected with the first roller 121a. The first trigger device 124a passes through the powder seat 11 and is exposed to the powder seat 11 . In this embodiment, the first trigger device 124a is a rotating shaft. The first triggering device 124a is offset from the axis of the first roller 121a, so that the first triggering device 124a can be triggered by the limiting device 30 to rotate in the first direction or in the second direction.

A first end of the reset member 13 is fixed in the forming chamber, and a second end of the reset member 13 is fixed in the first trigger device 124a. The reset member 13 is used to provide a restoring force to make the first trigger device 124a drive the first roller 121a to return to the initial state. In this embodiment, the reset member 13 is a spring.

The powder spreader 20 includes a powder spreader 21 , a powder feeder 22 , a scraper mechanism 23 and a resisting block 24 . The powder spreading seat 21 can be driven to reciprocate. In this embodiment, the powder spreading seat 21 can be connected to a powder spreading track (not shown in the figure), and can be controlled by a controller (not shown in the figure) to reciprocate along the powder spreading track. The powder spreading seat 21 can be driven actively or passively. Wherein, when the driving mechanism such as motor is installed on described powder spreading seat 21, described powder spreading seat 21 is driven by driving mechanism such as motor, and at this moment described powder spreading seat 21 is active drive, when the driving mechanism such as described motor When it is not installed on the powder spreading seat 21, the powder spreading seat 21 is driven by external motors and other driving mechanisms through connectors, such as ropes, etc. pulling and moving. At this time, the powder spreading seat 21 is driven passively. The powder spreading base 21 is formed with a first material storage channel 211 , a second material storage channel 212 , a first material delivery channel 213 , a second material delivery channel 214 and a second storage space 215 . The first storage channel 211 and the second storage channel 212 are spaced apart from each other. In the initial state, the powder spreading seat 21 is in the initial position, that is, the first storage channel 211 and the second storage channel 212 are respectively located in the first discharge channel 113 and the second discharge channel. Directly below channel 114. The first storage channel 211 is used for storing the first powder to be formed falling from the first discharge channel 113 . The second storage channel 212 is used to store the second powder to be formed falling from the second discharge channel 114 . The first feeding channel 213 is used for the first powder to be formed to fall to the powder spreading seat 21 . The second feeding channel 214 is spaced apart from the first feeding channel 213 . The second feeding channel 214 is used for the second powder to be formed to fall to the powder spreading seat 21 . The second storage space 215 is used to accommodate the powder feeder 22 .

The powder feeder 22 includes a second roller 221a. The second roller 221 a is rotatably accommodated in the second accommodation space 215 . A first channel 222a and a second channel 223a are formed on the second roller 221a. The first channel 222a and the second channel 223a pass through the circumferential surface of the second drum 221a. The first channel 222a and the second channel 223a are spaced apart from each other. In the initial state, the second roller 221a makes the first storage channel 211 and the first feeding channel 213 spaced apart from each other, and makes the second storage channel 212 and the second feeding channel 214 mutually spaced. interval. The second roller 221a can be driven by a motor, an air cylinder or a resisting block 24 to rotate in a third direction so that the first passage 222a communicates with the first storage passage 211 and the first feeding passage 213 (such as 3A), and can be driven by a motor, a cylinder or a resisting block 24 to rotate in a fourth direction so that the second passage 223a communicates with the second storage passage 212 and the second feeding passage 214 ( as shown in Figure 3B). In this embodiment, the second roller 221 a is driven to rotate by the resisting block 24 . In this embodiment, the third direction is clockwise, and the fourth direction is counterclockwise.

The powder feeder 22 also includes a second trigger device (not shown). The second trigger device is fixedly connected with the second roller 221a. The second trigger device passes through the powder spreading seat 21 and is exposed to the powder spreading seat 21 . In this embodiment, the second trigger device is a rotating shaft. The second triggering device is offset from the axis of the second roller 221a.

The scraper mechanism 23 is fixed below the powder spreading seat 21 . The scraper mechanism 23 may include one or more scrapers. In this embodiment, the scraper mechanism 23 includes a scraper. In this embodiment, the first powder to be molded falling from the first feeding channel 213 and the second powder to be molded falling from the second feeding channel 214 are fed from the left and right sides of the scraper mechanism 23 respectively. side drop. The scraper mechanism 23 is used to scrape off the powder to be formed falling into the molding area 40 from the first feeding channel 213 or from the second feeding channel 214 .

The resisting block 24 is fixed in the forming chamber. In this embodiment, the resisting block 24 includes a first resisting block 241 and a second resisting block 242 . The first resisting block 241 and the second resisting block 242 are respectively arranged at two ends of the stroke of the powder spreading seat 21 . In this embodiment, the first resisting block 241 and the second resisting block 242 are respectively arranged at the leftmost end and the rightmost end of the stroke of the powder spreading seat 21 . The first resisting block 241 and the second resisting block 242 are used to resist the second trigger device. In this embodiment, since the second triggering device is offset from the axis of the second roller 221a, the second triggering device can be resisted by the first resisting block 241 and rotate in the fourth direction. , and can be resisted by the second resisting block 242 to rotate in the third direction, thereby driving the second roller 221a to rotate in the fourth direction or in the third direction. In this embodiment, the first resisting block 241 and the second resisting block 242 can also be driven by a rotary cylinder to rotate so as not to resist the second triggering device.

Please continue to refer to FIG. 4 , the limiting device 30 is fixed above the powder spreading seat 21 . The limiting device 30 includes a limiting block 31 and a rotary cylinder 32 . The rotary cylinder 32 is fixed above the powder spreading seat 21 . The rotary cylinder 32 is fixedly connected with the limiting block 31 . The rotary cylinder 32 can be controlled by the controller to drive the limit block 31 to rotate. In this embodiment, the rotating cylinder 32 drives the limiting block 31 to rotate 90 degrees. The limiting block 31 is used to be driven by the rotary cylinder 32 to switch between a trigger state and a non-trigger state. In this embodiment, the cross section of the limiting block 31 is U-shaped. In other embodiments, the section of the limiting block 31 is V-shaped or the like. Please continue to refer to Figure 5A and Figure 5B, Figure 5A is a schematic diagram of the limit device and the first trigger device of the powder feeder in the triggered state; Figure 5B is a schematic diagram of the limit device and the first trigger device of the powder feeder in the non-triggered state schematic diagram. In the triggered state, the limiting block 31 can trigger the first triggering device 124a to rotate along the first direction or along the second direction, thereby driving the first roller 121a along the first direction or along the Turn in the second direction. In the non-triggered state, the limiting block 31 is far away from the first triggering device 124a, so that the powder spreading seat 21 can move freely.

The inside of the molding area 40 is equipped with a lifting movable bottom plate 41 . During the working process, after the sintering process of one layer of powder to be formed is completed, the lifting movable bottom plate 41 is lowered by one layer, and the powder spreader 20 is made to spread the powder to be formed in order to carry out a new layer of powder to be formed. Sintering action of shaped powder.

In this embodiment, the powder spreading device 1 further includes a powder collecting device. The powder collecting device includes a first powder collector 61 and a second powder collector 62 . In this embodiment, the first powder collector 61 and the second powder collector 62 are respectively located on the left and right sides of the molding area 40 . During the process of the powder spreader 21 moving along the fifth direction so that the powder spreader 20 lays the first powder to be molded in the molding area 40, due to the phenomenon that there may be excess powder, it can be passed through the The first powder collector 61 is used to collect the excess powder when the powder spreader 20 runs along the fifth direction, and the powder spreader 20 moves along the sixth direction on the powder spreader 20 During the process of laying the second powder to be molded in the molding area 40, due to the phenomenon that there may be excess powder, it can be collected by the second powder collector 62 along the powder spreader 20. The sixth direction runs the excess powder during powder spreading, so as to ensure the quality of powder spreading. In this embodiment, the fifth direction is from left to right, and the sixth direction is from right to left.

When the first powder to be formed is added, the powder spreading seat 21 is controlled by the controller to move in the fifth direction near the initial position, driving the limiting block 31 to trigger the first triggering device 124a, the first triggering device 124a drives the first roller 121a to rotate along the first direction until the limiting block 31 is away from the first triggering device 124a, at this time, the first roller 121a A certain amount of first powder to be formed contained in a storage tank 122a is transported from the first feed channel 111 to the first discharge channel 113, and falls to the first discharge channel 113 through the first discharge channel 113. The material storage channel 211 , the first trigger device 124a drives the first roller 121a to return to the initial state under the action of the reset member 13 . At this time, the controller controls the rotary cylinder 32 to drive the limit block 31 to rotate, the limit block 31 is far away from the first trigger device 124a, and the powder spreading seat 21 can freely move along the sixth direction movement. The controller can control the reciprocating movement of the powder spreading seat 21 multiple times according to the required powder spreading amount, so that the first roller 121a can reciprocate and rotate multiple times to carry out quantitative adding of the first powder to be formed multiple times.

When adding the second powder to be molded, the powder spreader 21 is controlled by the controller to move in the sixth direction near the initial position, driving the limiting block 31 to trigger the first triggering device 124a, the first triggering device 124a drives the first roller 121a to rotate in the second direction until the limit block 31 is away from the first triggering device 124a, at this time, the first roller 121a of the first roller 121a The quantitative second powder to be formed in the second storage tank 123a is transported from the second feeding channel 112 to the second discharge channel 114, and falls to the second discharge channel 114 through the second discharge channel 114. In the material storage channel 212 , the first trigger device 124 a drives the first roller 121 a to return to the initial state under the action of the reset member 13 . At this time, the controller controls the rotary cylinder 32 to drive the limit block 31 to rotate, the limit block 31 is far away from the first trigger device 124a, and the powder spreading seat 21 can freely move along the fifth direction movement. The controller can control the reciprocating movement of the powder spreading seat 21 multiple times according to the required powder spreading amount, so that the first roller 121a can reciprocate and rotate multiple times to perform quantitative adding of the second powder to be formed multiple times.

When spreading the second powder to be formed, the powder spreading seat 21 is controlled by the controller to move in the sixth direction near the initial position until the second triggering device abuts against the first abutting block 241, the second trigger device is resisted by the first resisting block 241 and rotates in the fourth direction, driving the second drum 221a to rotate in the fourth direction, so that the second storage The channel 212 communicates with the second feeding channel 214 through the second channel 223a. The second powder to be formed in the second storage channel 212 falls into the forming area 40 from the right side of the scraper mechanism 23 through the second channel 223 a and the second feeding channel 214 . The powder spreader 21 is controlled by the controller to move along the fifth direction so that the powder spreader 20 performs a powder spread operation on the molding area 40, so that the second powder to be molded is laid on the In the molding area 40 described above.

When laying the first powder to be formed, the powder spreading seat 21 is controlled by the controller at the end of the stroke of the powder spreading seat 21, that is, the rightmost end in FIG. 1, and moves in the fifth direction nearby. Until the second triggering device abuts against the second abutting block 242, the second triggering device is abutted by the second abutting block 242 and rotates in the third direction, driving the second roller 221a rotates along the third direction, so that the first storage channel 211 and the first feeding channel 213 communicate through the first channel 222a. The first powder to be formed in the first storage channel 211 falls into the forming area 40 from the left side of the scraper mechanism 23 through the first channel 222 a and the first feeding channel 213 . The powder spreader 21 is controlled by the controller to move along the sixth direction so that the powder spreader 20 performs a powder spread operation on the molding area 40, so that the first powder to be molded is laid on the In the molding area 40 described above.

Obviously, the present invention is not limited to realizing continuous powder spreading of various materials, that is, when the powder spreading seat 21 moves along the fifth direction, the powder spreading device 20 spreads the second powder to be molded, and the spreading powder When the powder base 21 moves along the sixth direction, the powder spreader 20 spreads the first powder to be shaped. The present invention can also realize continuous powder spreading of a material, such as the continuous powder spreading of the second powder to be formed, specifically: when the powder spreading seat 21 moves along the fifth direction, the powder spreading device 20 For the second powder to be molded, when the powder spreader 21 moves along the sixth direction, the second resisting block 242 rotates, and the second roller 221a moves the first storage channel 211 and the The first feeding channel 213 is separated, so that the first powder to be shaped does not fall from the first feeding channel 213, and the powder spreader 20 does not spread powder. Alternatively, the continuous powder spreading of the first powder to be formed can also be realized, specifically: when the powder spreading seat 21 moves in the fifth direction, the first abutting block 241 rotates, and the second roller 221a moves the powder The second storage channel 212 and the second feeding channel 214 are separated, so that the second powder to be molded does not fall from the second feeding channel 214, the powder spreader 20 does not spread powder, and the When the powder spreader 21 moves along the sixth direction, the powder spreader 20 spreads the first powder to be shaped. The present invention can also realize layer-selective powder spreading, for example, spreading the second powder to be formed on the first layer, spreading the first powder to be formed on the second layer, not spreading powder on the third layer, and spreading the first powder to be formed on the fourth layer. 1. Powder to be shaped, the second powder to be shaped is spread on the fifth layer, and no powder is spread on the sixth layer.

The present invention realizes the provision of the first powder to be molded and the second powder to be molded by setting the first powder supply bin 51 and the second powder supply bin 52; by controlling the first roller 121a once or multiple reciprocating motions to achieve multiple quantitative powder addition actions to accurately control the powder spreading amount; by controlling the first roller 121a to rotate along the first direction or rotate along the second direction to achieve adding The first powder to be formed or the second powder to be formed is added; the powder adding action is realized by controlling the first roller 121a to rotate in the first direction or in the second direction, without precisely controlling the second The rotation angle of the first roller 121a reduces the installation accuracy requirements of the powder spreading device 1; the first roller 121a is driven to rotate through the limit block 31, and no driving mechanism such as a motor is needed to drive the first roller 121a , saving energy; through the reset member 13, the first roller 121a automatically returns to the initial position; through the rotary cylinder 32, the limit block 31 is driven to rotate, so that the limit block 31 is away from or triggers the The first trigger device 124a realizes the selection of adding powder or not adding powder, and the selection of adding the first powder to be formed and/or adding the second powder to be formed; through the first abutting block 241 Resisting the second triggering device to achieve spreading the second powder to be formed, and spreading the first powder to be formed by resisting the second triggering device by the second abutting block 242; through the The rotary cylinder 32 drives the first abutment block 241 and the second abutment block 242 to rotate, so that the first abutment block 241 is away from or triggers the second triggering device, realizing laying the first to-be The selection of forming powder and/or laying the second powder to be formed realizes single or multiple material continuous or layer-selected powder spreading; the excess powder is collected by the powder collecting device to ensure the quality of powder spreading.

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of a powder spreading device according to a second embodiment of the present invention, wherein the intermediate powder feeder and the powder spreading device of the powder spreading device are in a cut-off state. The powder spreading device of the second embodiment of the present invention is similar in structure to the powder spreading device of the first embodiment, the difference lies in: the structure of the powder supply device, the connection relationship between the reset member and the powder supply device, The structure of the powder feeder, specifically:

The powder supply device 12 includes a first moving block 121b. The first moving block 121 b is moved and accommodated in the first accommodation space 115 . A first through hole 122b and a second through hole 123b are formed on the first moving block 121b. The first through hole 122b and the second through hole 123b pass through the first surface and the second surface of the first moving block 121b. The second surface is opposite to the first surface. In this embodiment, the first surface is an upper surface, and the second surface is a lower surface. The second through hole 123b is spaced apart from the first through hole 122b. In this embodiment, in an initial state, the first through hole 122b communicates with the first feeding channel 111 , and the second through hole 123b communicates with the second feeding channel 112 . The first through hole 122b is used to accommodate the first powder to be molded, and the second through hole 123b is used to accommodate the second powder to be molded. The first moving block 121b can be driven by a motor, a cylinder or a limit device 30 to move in the first direction so that the first through hole 122b communicates with the first discharge channel 113 (as shown in FIG. 7A ), and can move along the second direction so that the second through hole 123b communicates with the second discharge channel 114 (as shown in FIG. 7B ). In this embodiment, the first moving block 121b is driven by the limiting device 30 to move. In this embodiment, the first direction is from right to left, and the second direction is from left to right. In this embodiment, the moving distance of the first moving block 121b along the first direction may be within a predetermined range, as long as it can realize the communication between the first through hole 122b and the first discharge channel 113 , and the moving distance along the second direction can also be within a predetermined range, as long as it can realize the communication between the second through hole 123b and the second discharge channel 114, without precisely controlling the first moving block 121b distance traveled. In this embodiment, the first moving block 121b can be driven one or more times to move along the first direction one or more times to move the first powder to be molded contained in the first through hole 122b from the first through hole 122b The first feed channel 111 is transported to the first discharge channel 113, and can be driven one or more times to move along the second direction one or more times to accommodate the second through hole 123b. The powder to be shaped is transported from the second feeding channel 112 to the second discharging channel 114 . Therefore, the present invention can control the powder spreading amount of the powder spreading device by controlling the first moving block 121b to move one or more times to realize one or more quantitative powder additions.

In other embodiments, in the initial state, the first through hole 122b is separated from the first feeding channel 111, and the second through hole 123b is separated from the second feeding channel 112. . The first moving block 121b can be driven to move along the first direction so that the first through hole 122b communicates with the first feeding channel 111 to accommodate the first powder to be molded, and continues along the When the first direction is rotated, the first through hole 122b communicates with the first discharge channel 113, so that the first powder to be molded is transported from the first feed channel 111 to the first discharge channel 113. Outlet channel 113. The first moving block 121b can be driven to move along the second direction so that the second through hole 123b communicates with the second feeding channel 112 to accommodate the second powder to be molded, and continues along the When moving in the second direction, the second through hole 123b communicates with the second discharge channel 114, so that the second powder to be molded is transported from the second feed channel 112 to the second discharge channel 114. Outlet channel 114.

The powder feeder 12 also includes a first trigger device (not shown). The first trigger device is fixedly connected with the first moving block 121b. In this embodiment, the first trigger device is a connection block or any other suitable structure. The first triggering device can be triggered by the limiting device 30 to move along the first direction or along the second direction. In this embodiment, the first end of the reset member 13 is fixed in the forming chamber, and the second end of the reset member 13 is fixed in the first moving block 121b. The reset member 13 is used to provide a restoring force to make the first moving block 121b return to an initial state. In other embodiments, the first end of the reset member 13 is fixed in the forming chamber, and the second end of the reset member 13 is fixed in the first trigger device. The reset member 13 is used to provide a restoring force to make the first trigger device drive the first moving block 121b to return to an initial state.

The powder feeder 22 includes a second moving block 221b. The second moving block 221 b is moved and accommodated in the second accommodation space 215 . A third through hole 222b and a fourth through hole 223b are formed on the second moving block 221b. The third through hole 222b and the fourth through hole 223b pass through the first surface and the second surface of the second moving block 221b. The second surface is opposite to the first surface. In this embodiment, the first surface is an upper surface, and the second surface is a lower surface. The fourth through hole 223b is spaced apart from the third through hole 222b. In the initial state, the second moving block 221b makes the first storage channel 211 and the first feeding channel 213 spaced apart from each other, and makes the second storage channel 212 and the second feeding channel 214 spaced from each other. The second moving block 221b can be driven by a motor, an air cylinder or a resisting block to move along the third direction so that the third through hole 222b is connected to the first material storage channel 211 and the first material delivery channel 213 communicated (as shown in FIG. 8A ), and can be driven by a motor, a cylinder or a resisting block to move in a fourth direction so that the fourth through hole 223b is connected to the second storage channel 212 and the second feeding channel 214 are connected (as shown in Figure 8B). In this embodiment, the second moving block 221b is driven to move by the resisting block. In this embodiment, the third direction is from right to left, and the fourth direction is from left to right.

The powder feeder 22 also includes a second trigger device (not shown). The second trigger device is fixedly connected with the second moving block 221b. In this embodiment, the second trigger device is a connection block or any other suitable structure. The second triggering device can be triggered by the limiting device 30 to move along the third direction or along the fourth direction.

When the first powder to be formed is added, the powder spreading seat 21 is controlled by the controller to move in the fifth direction near the initial position, driving the limiting block 31 to trigger the first triggering device , the first triggering device drives the first moving block 121b to move along the first direction until the limiting block 31 is away from the first triggering device, at this time, the first moving block 121b The quantitative first powder to be formed contained in the through hole 122b is transported from the first feed channel 111 to the first discharge channel 113, and falls through the first discharge channel 113 to the first storage. The material channel 211, the first moving block 121b returns to the initial state under the action of the reset member 13. At this time, the controller controls the rotary cylinder 32 to drive the limit block 31 to rotate, the limit block 31 is far away from the first trigger device, and the powder spreading seat 21 can freely move along the sixth direction. sports. The controller can control the reciprocating movement of the powder spreading seat 21 multiple times according to the required powder spreading amount, so that the first moving block 121b can reciprocate multiple times to perform multiple quantitative addition of the first powder to be formed. .

When adding the second powder to be molded, the powder spreader 21 is controlled by the controller to move in the sixth direction near the initial position, driving the limiting block 31 to trigger the first triggering device , the first triggering device drives the first moving block 121b to move along the second direction until the limiting block 31 is away from the first triggering device, at this time, the second of the first moving block 121b The quantitative second powder to be formed contained in the through hole 123b is transported from the second feed channel 112 to the second discharge channel 114, and falls through the second discharge channel 114 to the second storage. The material channel 212, the first moving block 121b returns to the initial state under the action of the reset member 13. At this time, the controller controls the rotary cylinder 32 to drive the limit block 31 to rotate, the limit block 31 is far away from the first trigger device, and the powder spreading seat 21 can freely move along the fifth direction. sports. The controller can control the reciprocating movement of the powder spreading seat 21 multiple times according to the required powder spreading amount, so that the first moving block 121b can reciprocate multiple times to perform multiple quantitative addition of the second powder to be formed. .

When spreading the second powder to be formed, the powder spreading seat 21 is controlled by the controller to move in the sixth direction near the initial position until the second triggering device abuts against the first abutting block 241, the second trigger device is resisted by the first resisting block 241 and moves in the fourth direction, driving the second moving block 221b to move in the fourth direction, so that the second storage The feeding channel 212 communicates with the second feeding channel 214 through the fourth through hole 223b. The second powder to be formed in the second storage channel 212 falls from the right side of the scraper mechanism 23 into the forming area through the fourth through hole 223 b and the second feeding channel 214 . The powder spreader 21 is controlled by the controller to move along the fifth direction so that the powder spreader 20 performs a powder spread operation on the forming area, so that the second powder to be formed is laid on the in the forming area.

When laying the first powder to be formed, the powder spreading seat 21 is controlled by the controller at the end of the stroke of the powder spreading seat 21, that is, the rightmost end in FIG. 6, and moves in the fifth direction nearby. Until the second trigger device abuts against the second abutment block 242, the second trigger device is abutted by the second abutment block 242 and moves along the third direction, driving the second movement The block 221b moves along the third direction, so that the first storage channel 211 and the first feeding channel 213 communicate through the third through hole 222b. The first powder to be formed in the first storage channel 211 falls into the forming area from the left side of the scraper mechanism 23 through the third through hole 222 b and the first feeding channel 213 . The powder spreader 21 is controlled by the controller to move along the sixth direction so that the powder spreader 20 performs a powder spread operation on the molding area, so that the first powder to be molded is laid on the in the forming area.

The powder spreading device of the third embodiment of the present invention is similar in structure to the powder spreading device of the first embodiment, the difference lies in: the structure of the powder supply device, the connection relationship between the reset member and the powder supply device, specifically:

The powder feeder includes a first moving block. The first moving block is moved and accommodated in the first accommodation space. A first through hole and a second through hole are formed on the first moving block. The first through hole and the second through hole pass through the first surface and the second surface of the first moving block. The second surface is opposite to the first surface. In this embodiment, the first surface is an upper surface, and the second surface is a lower surface. The second through hole is spaced apart from the first through hole. In this embodiment, in an initial state, the first through hole communicates with the first feeding channel, and the second through hole communicates with the second feeding channel. The first through hole is used to accommodate the first powder to be molded, and the second through hole is used to accommodate the second powder to be molded. The first moving block can be driven by a motor, an air cylinder or a limiting device to move in the first direction so that the first through hole communicates with the first discharge channel and can move in the second direction The second through hole communicates with the second discharge channel. In this embodiment, the first moving block is driven to move by the limiting device. In this embodiment, the first direction is from right to left, and the second direction is from left to right. In this embodiment, the moving distance of the first moving block along the first direction may be within a predetermined range, as long as it can realize the communication between the first through hole and the first discharge channel, and The moving distance in the second direction can also be within a predetermined range, as long as it can realize the communication between the second through hole and the second discharge channel, and there is no need to precisely control the moving distance of the first moving block. In this embodiment, the first moving block can be driven one or more times to move along the first direction one or more times to move the first powder to be molded contained in the first through hole from the first through hole A feed channel is transported to the first discharge channel, and can be driven one or more times to move along the second direction one or more times to move the second powder to be formed contained in the second through hole from The second feed channel is transported to the second discharge channel. Therefore, the present invention can control the powder spreading amount of the powder spreading device by controlling the first moving block to move one or more times to realize one or more quantitative powder additions.

In other embodiments, in an initial state, the first through hole is separated from the first feeding channel, and the second through hole is separated from the second feeding channel. The first moving block can be driven to move along the first direction so that the first through hole communicates with the first feeding channel to accommodate the first powder to be molded, and continues to move along the first direction. When rotating in one direction, the first through hole communicates with the first discharge channel, so that the first powder to be shaped is transported from the first feed channel to the first discharge channel. The first moving block can be driven to move along the second direction so that the second through hole communicates with the second feeding channel to accommodate the second powder to be molded, and continues to move along the second direction. When moving in two directions, the second through hole communicates with the second discharge channel, so that the second powder to be shaped is transported from the second feed channel to the second discharge channel.

The first trigger device is fixedly connected with the first moving block. In this embodiment, the first trigger device is a connection block or any other suitable structure. The first triggering device can be triggered by the limiting device to move along the first direction or along the second direction. In this embodiment, the first end of the reset member is fixed in the forming chamber, and the second end of the reset member is fixed in the first moving block. The reset member is used to provide a restoring force to make the first moving block return to an initial state. In other embodiments, the first end of the reset member is fixed in the forming chamber, and the second end of the reset member is fixed in the first trigger device. The reset member is used to provide a restoring force to make the first trigger device drive the first moving block to return to an initial state.

When the first powder to be formed is added, the powder spreader is controlled by the controller to move in the fifth direction near the initial position, driving the limit block to trigger the first trigger device, so The first triggering device drives the first moving block to move along the first direction until the limiting block is away from the first triggering device, at this time, the quantitative amount accommodated in the first through hole of the first moving block The first powder to be molded is transported from the first feed channel to the first discharge channel, and falls to the first storage channel through the first discharge channel, and the first moving block The original state is restored under the action of the reset member. At this time, the controller controls the rotary cylinder to drive the limit block to rotate, the limit block is away from the first trigger device, and the powder spreading seat can freely move along the sixth direction. The controller can control the reciprocating movement of the powder spreading seat multiple times according to the required powder spreading amount so that the first moving block can reciprocate multiple times to add the first powder to be formed quantitatively for multiple times.

When the second powder to be formed is added, the powder spreader is controlled by the controller to move in the sixth direction near the initial position, driving the limit block to trigger the first trigger device, so The first triggering device drives the first moving block to move along the second direction until the limiting block is away from the first triggering device. The second powder to be molded is transported from the second feed channel to the second discharge channel, and falls to the second storage channel through the second discharge channel, and the first moving block The original state is restored under the action of the reset member. At this time, the controller controls the rotary cylinder to drive the limit block to rotate, the limit block is away from the first trigger device, and the powder spreading seat can freely move along the fifth direction. The controller can control the reciprocating movement of the powder spreading seat multiple times according to the required powder spreading amount so that the first moving block can reciprocate multiple times to add the second powder to be formed quantitatively for multiple times.

The powder spreading device of the fourth embodiment of the present invention is similar in structure to the powder spreading device of the first embodiment, the difference lies in: the structure of the powder feeder, specifically:

The powder feeder includes a second moving block. The second moving block is moved and accommodated in the second accommodation space. A third through hole and a fourth through hole are formed on the second moving block. The third through hole and the fourth through hole pass through the first surface and the second surface of the second moving block. The second surface is opposite to the first surface. In this embodiment, the first surface is an upper surface, and the second surface is a lower surface. The fourth through hole is spaced apart from the third through hole. In an initial state, the second moving block makes the first material storage channel and the first discharge channel spaced apart from each other, and makes the second material storage channel and the second material delivery channel spaced apart from each other. The second moving block can be driven by a motor, an air cylinder or a resisting block to move along the third direction so that the third through hole communicates with the first material storage channel and the first material feeding channel, and can Driven by a motor, an air cylinder or a resisting block to move in a fourth direction so that the fourth through hole communicates with the second material storage channel and the second material delivery channel. In this embodiment, the second moving block is driven to move by the resisting block. In this embodiment, the third direction is from right to left, and the fourth direction is from left to right.

The second trigger device is fixedly connected with the second moving block. In this embodiment, the second trigger device is a connection block or any other suitable structure. The second triggering device can be triggered by the limiting device to move in the third direction or in the fourth direction.

When spreading the second powder to be formed, the powder spreading seat is controlled by the controller to move in the sixth direction near the initial position until the second trigger device abuts against the first abutting block, The second trigger device is resisted by the first resisting block and moves in the fourth direction, driving the second moving block to move in the fourth direction, so that the second material storage channel and the The second feeding channel communicates through the fourth through hole. The second powder to be formed in the second storage channel falls from the right side of the scraper mechanism into the forming area through the fourth through hole and the second feeding channel. The powder spreader is controlled by the controller to move in the fifth direction so that the powder spreader performs a powder spread operation on the molding area, so that the second powder to be molded is laid on the molding area Inside.

When laying the first powder to be formed, the powder spreader is controlled by the controller to move in the fifth direction near the end of the stroke of the powder spreader until the second triggering device abuts the The second resisting block, the second triggering device is resisted by the second resisting block and moves along the third direction, driving the second moving block to move along the third direction, so that the first A storage channel communicates with the first feeding channel through the third through hole. The first powder to be formed in the first storage channel falls from the left side of the scraper mechanism into the forming area through the third through hole and the first feeding channel. The powder spreader is controlled by the controller to move along the sixth direction so that the powder spreader performs a powder spread operation on the molding area, so that the first powder to be molded is laid on the molding area Inside.

Please refer to FIG. 9 . FIG. 9 is a schematic structural diagram of a printer according to the present invention with some structures omitted. The printer 100 includes a powder spreading device 1 and a laser device 2, and the powder spreading device 1 can be the powder spreading device of the first embodiment of the present invention, or the powder spreading device of the second embodiment, or the powder spreading device of the third embodiment Powder device, or the powder spreading device of the fourth embodiment. The laser device 2 is used for sintering the powder to be formed on the forming area in the powder spreading device 1 .

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed invention.

Claims (10)

1. The utility model provides a spread powder device, its characterized in that spread powder device includes shaping storehouse, middle powder ware and shop's powder ware, wherein:

The middle powder feeder is fixed in the forming bin and comprises a powder seat and a powder feeder, a first feeding channel, a second feeding channel, a first discharging channel, a second discharging channel and a first containing space are formed on the powder seat, the first feeding channel is used for containing first powder to be formed, the second feeding channel is spaced from the first feeding channel, the second feeding channel is used for containing second powder to be formed, the first discharging channel is used for enabling the first powder to be formed to fall from the powder seat, the second discharging channel is spaced from the first discharging channel, the second discharging channel is used for enabling the second powder to be formed to fall from the powder seat, the first containing space is used for containing the powder feeder, and the powder feeder is driven once or many times to move once or many times along a first direction to convey the first powder to be formed from the first feeding channel to the first discharging channel The first discharging channel is driven one or more times to move one or more times along a second direction so as to convey the second powder to be molded to the second discharging channel from the second feeding channel;

Powder paving device remove set up in the shaping storehouse, and be located middle powder ware below, powder paving device includes scraper mechanism, scraper mechanism be used for with first treat the shaping powder or the shaping powder is treated to the second and is paved.

2. a dusting apparatus as claimed in claim 1, characterised in that:

the powder feeder comprises a first roller which is rotatably accommodated in the first accommodating space, a first accommodating groove and a second accommodating groove are formed on the first roller and are arranged on the circumferential surface of the first roller, the first containing groove is used for containing the first powder to be molded, the second containing groove is used for containing the second powder to be molded, the first roller is driven one or more times to rotate one or more times along the first direction, so that the first containing groove is communicated with the first discharging channel to convey the first powder to be molded from the first feeding channel to the first discharging channel, and the powder to be molded is driven one or more times to rotate one or more times along the second direction, so that the second containing groove is communicated with the second discharging channel, and the second powder to be molded is conveyed from the second feeding channel to the second discharging channel.

3. A dusting apparatus as claimed in claim 1, characterised in that:

The powder feeder comprises a first moving block which is movably accommodated in the first accommodating space, a first through hole and a second through hole are formed on the first moving block, the first through hole is used for containing the first powder to be molded, the second through hole is used for accommodating the second powder to be molded, the first moving block is used for being driven for one or more times and translating for one or more times along the first direction, so that the first through hole moves to be communicated with the first discharging channel, and the first powder to be molded is conveyed to the first discharging channel from the first feeding channel, and is driven one or more times to translate one or more times along the second direction so that the second through hole is communicated with the second discharging channel to convey the second powder to be molded from the second feeding channel to the second discharging channel.

4. A dusting apparatus as claimed in claim 2, characterised in that:

The powder feeder further comprises a trigger device, the trigger device is fixedly connected with the first roller, the trigger device penetrates through the powder seat and is exposed out of the powder seat, the powder spreading device further comprises a limiting device, the limiting device is fixed above the powder spreading device, and the limiting device is used for triggering the trigger device to drive the first roller to rotate.

5. a dusting apparatus as claimed in claim 4, characterised in that:

The limiting device comprises a limiting block and a rotary cylinder, the rotary cylinder is fixed above the powder spreader, the rotary cylinder is fixedly connected with the limiting block, the rotary cylinder is used for driving the limiting block to rotate, the limiting block is switched between a trigger state and a non-trigger state, the limiting block is used for triggering the trigger device under the trigger state, and the limiting block is far away from the trigger device under the non-trigger state.

6. a dusting apparatus as claimed in claim 4, characterised in that:

The middle powder feeder further comprises a resetting piece, the first end of the resetting piece is fixed in the forming bin, and the second end of the resetting piece is fixedly connected with the triggering device.

7. A dusting apparatus as claimed in claim 1, characterised in that:

The powder spreading device further comprises a powder spreading seat and a powder feeder, the powder spreading seat is movably arranged in the forming bin, a first material storage channel, a second material storage channel, a first material feeding channel, a second material feeding channel and a second accommodating space are formed in the powder spreading seat, the first material storage channel is used for storing first powder to be formed falling from the first material discharging channel, the second material storage channel is used for storing second powder to be formed falling from the second material discharging channel, the second accommodating space is used for accommodating the powder feeder, the powder feeder is used for being driven to move in a third direction to enable the first material storage channel to be communicated with the first material feeding channel and to be driven to move in a fourth direction to enable the second material storage channel to be communicated with the second material feeding channel, the scraper mechanism is fixed below the powder spreading seat, and the first powder to be formed falling from the first material feeding channel and the second powder feeding channel falls from the second material feeding channel The second falling powder to be molded is positioned on two sides of the scraper mechanism.

8. A dusting apparatus as claimed in claim 7, characterised in that:

the powder feeder comprises a second roller, the second roller is rotatably accommodated in a second accommodating space, a first channel and a second channel are formed on the second roller, the first channel and the second channel penetrate through the circumferential surface of the second roller, and the second roller is driven to rotate in the third direction to enable the first channel to be communicated with the first material storage channel and the first material feeding channel and to be driven to rotate in the fourth direction to enable the second channel to be communicated with the second material storage channel and the second material feeding channel.

9. A dusting apparatus as claimed in claim 7, characterised in that:

the powder feeder comprises a second moving block, the second moving block is movably accommodated in the second accommodating space, a third through hole and a fourth through hole are formed in the second moving block, the second moving block is used for being driven to translate along the third direction so that the third through hole is communicated with the first storage channel and the first feeding channel, and is driven to translate along the fourth direction so that the fourth through hole is communicated with the second storage channel and the second feeding channel.

10. A printer comprising a powder spreading device according to any one of claims 1 to 9 and a laser device for outputting a laser beam to sinter the first powder to be molded and the second powder to be molded.